Bragg gratings with index modulations of ~3x10^4 is reported in antimony (Sb) codoped fibres. Gratings in germanium-free fibres of different Sb concentration are analysed and those in higher concentration fibres are found the more temperature-resistant.

Abstract

Bragg gratings with index modulations of ~3x10^4 is reported in antimony (Sb) codoped fibres. Gratings in germanium-free fibres of different Sb concentration are analysed and those in higher concentration fibres are found the more temperature-resistant.